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The inspection report said: “During the inspection, an officer supervising a visit for a prisoner in the unit appeared asleep.

“As this was wholly inappropriate, we referred the matter to the management team for action.”

Last month, inspectors revealed that terror suspects at another high security prison, Long Lartin in Worcestershire, had complained about feeling “claustrophobic” because they were held in isolation from the rest of the prison.

The prisons watchdog even suggested removing cladding from a perimeter fence to enable the suspects to see the horizon.

But when the authorities proposed that the detainees be allowed to mingle with paedophiles and other vulnerable prisoners, the offer was refused because the suspects said it would be "stigmatising" for them.